Heh, I check my fly all the time too, except at school. Like 3 times after I went to the bathroom. I probably look stupid looking down at my crotch in public.
I also pace a LOT. And I do things when taking a test in school like reading the question over four times and when I add stuff in math, even really simple addition like 7+5, I always use my calculator for it anyway even though I know it.